1. SUBJECT : EC8453 - LINEAR INTEGRATED CIRCUITS
SEMESTER/YEAR : IV /II
Unit I - BASICS OF OPERATIONAL AMPLIFIERS
Current mirror and current sources, Current sources as active loads, Voltage sources, Voltage References,
BJT Differential amplifier with active loads, Basic information about op-amps – Ideal Operational
Amplifier - General operational amplifier stages -and internal circuit diagrams of IC 741, DC and AC
performance characteristics, slew rate, Open and closed loop configurations – JFET Operational
Amplifiers – LF155 and TL082.
PART - A
Q.No Questions
BT
Level
Competence
1. Outline the importance of offset voltage of an operational amplifier? BTL 1 Remembering
2. Define CMRR. BTL 1 Remembering
3. Mention the importance of current mirror circuit used in differential amplifier
stages.
BTL 2 Understanding
4. Specify the ideal characteristics of Op-amp and methods can be used to produce
voltage sources.
BTL 1 Remembering
5. How will you understanding the term ‘thermal drift’? BTL 1 Remembering
6. Write short note about current mirror with magnification. BTL 1 Remembering
7. Define slew rate and what causes the slew rate? BTL 1 Remembering
8. State loading effect? How can you reduce it? BTL 2 Understanding
9. Why do we use Rcomp resistor? BTL 2 Understanding
10. What is the gain cross over and phase cross over frequencies? BTL 2 Understanding
11. Categorize the characteristics of Non-ideal op-amp. BTL 3 Applying
12. Develop the internal block diagram of an Op-amp. BTL 3 Applying
13. Illustrate the pin diagram of IC 741. BTL 3 Applying
14. Examine the importance of input off set current. BTL 3 Applying
15. Analyze about input bias current. BTL 3 Applying
2. 3
16. Inspect the draw backs of using large RC in differential amplifier. BTL 3 Applying
17. Brief the necessity of active loads preferred than passive loads in the input stage
of an operational amplifier.
BTL 3 Applying
18. Justify that, why IC741 op-amp not used for high frequency applications? BTL 3 Applying
19. Calculate the maximum distorted amplitude that a sine wave input of 10 kHz,
can produce at the output of an op-amp whose slew-rate is 0.5v/μsec.
BTL 3 Applying
20. A Differential amplifier has a differential voltage gain of 2000 and common
mode gain of 0.2. Determine CMRR.
BTL 3 Applying
PART – B
1. Define and explain slew rate. Derive its equation. Also explain method
adapted to improving slew rate.
(13) BTL 1 Remembering
2. (i) Write down the characteristics and their respective values of an ideal
operational amplifier.
(ii) Draw the circuit of basic current mirror and explain its operation.
(6)
(7)
BTL 1 Remembering
3. (i) Describe about output offset voltage. Explain methods to nullify offset
voltage.
(ii) With neat circuit diagram, explain the operation of voltage reference
circuit using temperature compensation.
(7)
(6)
BTL 1 Remembering
4. (i) Discuss on current mirror with magnification.
(ii) Use appropriate block diagram, explain the general stages of an Op-
Amp IC.
(6)
(7)
BTL 2 Understanding
5. (i) What is input and output voltage and current offset? How are they
compensated?
(ii) With a neat diagram derive the AC performance close loop
characteristics of Op-amp to discuss on the circuit Bandwidth, Frequency
response and slew rate.
(7)
(6)
BTL 2 Understanding
6. (i) Draw the circuit of basic current mirror and explain its operation.
(ii) Give the detail the DC analysis of a basic differential amplifier.
(6)
(7)
BTL 3 Applying
7. Obtain the expression for differential gain, common mode gain, CMRR,
RI and RO of an emitter coupled differential amplifier.
(13) BTL 3 Applying
8. (i) Sketch the Wilson current source and give short note about it.
(ii) Using suitable diagram and necessary equations, explain the concept
of Widlar current source used in op-amp circuit.
(5)
(8)
BTL 3
BTL 3
Applying
Applying
9. Show the transfer characteristics of dual input differential amplifier
showing the linear and limiting regions. Comment on the same.
(13) BTL 3 Understanding
3. 4
10. (i) Derive the functional parameters for an inverting mode negative
feedback gain circuit with a 741op-amp in IC inverting mode, with
R1=1Kohm, Rf=40Kohm and compute Af, Rif, Rof, BW, offset
voltage.
(ii) Discuss briefly on the differential mode Instrumentation amplifier.
(7)
(6)
BTL 3
BTL 3
Applying
Applying
11. Examine the working principle of BJT differential amplifier with active
load.
(13)
BTL 3 Applying
12. (i) Compose the concept of Widlar current source used in op-amp circuit
with suitable circuit diagram and necessary equations.
(ii) Justify the preference of active load over passive load.
(10)
(3)
BTL 3 Applying
13. Write note about LF155 JFET input operational amplifier and TL082
wide bandwidth dual JFET input operational amplifier with necessary
diagram.
(13) BTL 1 Remembering
14. State and explain about CMRR, Ad, Ac and suggest a method to improve
CMRR.
(13) BTL 3 Applying
PART – C
1.
Derive the transfer characteristics of dual input differential amplifier
showing the linear and limiting regions. Comment on the same.
(15)
BTL 3 Applying
2.
(i) A square wave peak-to-peak amplitude of 50mV has to be amplified
to a peak-to-peak amplitude of 3V, with rise time of 4 μs or less. Can
IC741 be used?
(ii) A IC741 Op-Amp whose slew rate is 0.5V/μs is used as an inverting
amplifier with a gain of 50.The voltage gain Vs frequency curve of IC741
is flat up to 20 kHz. What maximum peak to peak input signal can be
applied without distorting the output?
(5)
(10)
BTL 3 Applying
3.
Explain in detail the A.C analysis of dual input, balanced output
differential amplifier or derive the expression for differential gain,
common mode gain, CMRR, RI and RO of an emitter coupled differential
amplifier.
(15)
BTL 3 Applying
4. Illustrate each direct current characteristics of operational amplifier with
necessary equations and diagrams.
(15) BTL 3 Applying
UNIT II APPLICATIONS OF OPERATIONAL AMPLIFIERS
Sign Changer, Scale Changer, Phase Shift Circuits, Voltage Follower, V-to-I and I-to-V converters, adder,
subtractor, Instrumentation amplifier, Integrator, Differentiator, Logarithmic amplifier, Antilogarithmic
amplifier, Comparators, Schmitt trigger, Precision rectifier, peak detector, clipper and clamper, Low-pass,
high-pass and band-pass Butterworth filters.
PART - A
Q.No Questions
BT
Level
Competence
1. Mention the advantages of variable trans conductance technique? BTL 2 Understanding
2. Write the other name for Clipper circuit? BTL 2 Understanding
3. What is the need for converting a first order filter into a second order filter? BTL 2 Understanding
4. 5
4. How is the current characteristic of a PN junction employed in a log
amplifier?
BTL 1 Remembering
5. Compare the performance of inverting and non-inverting operational
amplifier configurations.
BTL 3 Applying
6. Give the applications of inverting & non- inverting amplifiers. BTL 1 Remembering
7. Draw the inverting & non- inverting amplifiers with appropriate equations. BTL 3 Applying
8. List the applications for each of the following circuits: Voltage follower,
Peak detector, Schmitt trigger, Clamper. BTL 2 Understanding
9. Why integrators are preferred over differentiators in analog computers? BTL 3 Applying
10. Summarize the frequency expressions for LPF, HPF and BPF. BTL 1 Remembering
11. Enumerate the advantages & disadvantages of passive filters? BTL 1 Remembering
12. Sketch the opamp integrator & differentiator circuit with necessary equation. BTL 3 Applying
13. Define comparator and function of a phase shift circuit ? BTL 1 Remembering
14. Illustrate some of the important features of an instrumentation amplifier. BTL 1 Remembering
15. Construct an adder circuit using op-amp to get the output expression as Vo
= - (0.1V1 +V2+5V3)
BTL 3 Applying
16. Demonstrate the need for frequency compensation in practical op-amps BTL 3 Applying
17. Show the necessity of active guard drive in an instrumentation amplifier. BTL 3 Applying
18. Find the output voltage of the following circuit. Given R1 =R2 = 10kΩ and
Rf = 100
BTL 3 Applying
19. How does precision rectifier differ from the conventional rectifier? BTL 3 Applying
20. Design an amplifier with a gain of -10 and input resistance equal to 10 k. BTL 3 Applying
PART – B
1. (i) With a suitable circuit diagram, explain the operating
principle of an instrumentation amplifier and derive its
gain.
(ii) Design a second order Butterworth low-pass filter having
upper cut-off frequency of 2.1961 kHz
(7)
(6)
BTL 2 Understanding
2. Compare and contrast Adder, Subtractor, and Averaging circuit using
op-amp with equations.
(13)
BTL 3 Applying
3. Illustrate the operation of current to voltage and Voltage to current
converter circuits.
(13)
BTL 1 Remembering
4. (i) Draw and explain the operation of Triangular wave generator.
(ii) Write short notes on second order Low Pass Butterworth filter
(Sallen-key filter).
(5)
(8)
BTL 1
BTL 1
Remembering
Remembering
5. Derive the expression for log computation using op-amp and explain
necessary circuit diagram.
(13)
BTL 3 Applying
6. With neat figures describe the circuit using op-amps on the following
of
(i) Integrator and double integrator circuit
(ii) First order High pass filter
(7)
(6)
BTL 1 Remembering
5. 6
7. Draw and explain the circuit of a voltage to current converter if the
load is i) Floating
ii) Grounded
(7)
(6)
BTL 1 Remembering
8. (i) Design an OP-AMP based first order active low pass filter.
(ii) Applying a second order Butterworth LPF having upper cut-off
frequency 1 kHz. Determine the frequency response.
(8)
(5)
BTL 3 Applying
9. i) Analyze the distinct features of the precision diode.
ii) Using appropriate equations discuss about the working of Half
wave Precision Rectifier.
(3)
(10)
BTL 3
BTL3
Applying
Applying
10. (i) With neat sketch explain the working of Full wave Precision
Rectifier in detail.
(ii) Sketch the Integrator circuit and explain the working principle in
detail.
(8)
(5)
BTL 3 Applying
11. i) With neat diagram explain the operation of Schmitt trigger.
ii) Give detailed note about op-amp band pass filter.
(5)
(8) BTL 2 Understanding
12. Conclude that how antilog computations are performed using IC-741
explain using circuits and necessary equations.
(13)
BTL 3 Applying
13. (
(
i) Examine the principal of operation of Voltage follower with
the neat circuit diagram and mathematical expressions.
ii) With the neat circuit diagram and mathematical expressions,
explain the operation of Scale changer.
(6)
(7)
BTL 3
BTL 3
Applying
Applying
14. Discuss wave shaping circuits using operational amplifier. (13) BTL 2 Understanding
PART - C
1.
Evaluate Inverting adder and Non-inverting adder with neat circuit diagram
and mathematical expressions. (15) BTL 3 Applying
2.
Create any of three op-amp based mathematical function circuits (15)
BTL 3 Applying
3.
i) Design a Butterworth low pass filter circuit using operational amplifier. 10)
ii) Design a wide band filter having FL=400Hz, FH=2kHz and pass band
gain of 4.Find the value of Q of filter. (5)
BTL 3 Applying
4.
Justify that how the circuit using Op-amps on the operation of.
(i) Zerocross Detector, Clipper and Clamper circuit (8)
(ii) Scmitt Trigger. (7)
BTL 3 Applying
UNIT III ANALOG MULTIPLIER AND PLL
Analog Multiplier using Emitter Coupled Transistor Pair Gilbert Multiplier cell – Variable
transconductance technique, analog multiplier ICs and their applications, Operation of the basic PLL,
Closed loop analysis, Voltage controlled oscillator, Monolithic PLL IC 565, application of PLL for AM
detection, FM detection, FSK modulation and demodulation and Frequency synthesizing, Clock
synchronization
PART A
Q.No Questions BT
Level
Competence
1. Outline the basic building blocks of PLL. BTL 1 Remembering
2. Define capture range and lock range of PLL. BTL 1 Remembering
3. What is Pull‐in time? BTL 1 Remembering
6. 7
4. For perfect lock, what should be the phase relation between the
incoming signal and VCO output signal?
BTL 3 Applying
5. Mention the classification of phase detector. Write about switch type
phase detector.
BTL 2 Understanding
6. Illustrate the problems associated with switch type phase detector BTL 2 Understanding
7. Why VCO is also called as V to F converter? BTL 1 Remembering
8. On what parameters does the free running frequency of VCO depend
on?
BTL 3 Applying
9. Give the expression for the VCO free running frequency. BTL 2 Understanding
10. Demonstrate Voltage to Frequency conversion factor. BTL 2 Understanding
11. Develop the purpose of having a low pass filter in PLL. BTL 3 Applying
12. Discuss the effect of having large capture range. BTL 3 Applying
13. Estimate that the frequency stability obtained in a PLL by use of VCO. BTL 3 Applying
14.
How are square root and square of a signal obtained with multiplier
circuit?
BTL 1 Remembering
15. Identify the merits of companding BTL 3 Applying
16. List out the applications of OTA. BTL 1 Remembering
17.
Asses the need of pre-distortion circuits in Gilbert analog multiplier and
how is the configuration of Gilbert multiplier done with pre-distortion
circuits.
BTL 3 Applying
18. Analyze the necessity of modulation. BTL 3 Applying
19. Develop the circuit of AM detector using PLL. BTL 3 Applying
20. Distinguish the advantages & disadvantages of monolithic PLLs over
Discrete PLLs.
BTL 3 Applying
PART – B
1. How would you describe the block diagram of PLL and derive the
expression for Lock range and capture range. (13)
BTL 1 Remembering
2. Illustrate the operation of VCO with neat block diagram. Also derive an
expression for f0. (13)
BTL 2 Understanding
3. (i) Analyze the Gilbert’s four quadrant multiplier cell with a neat circuit
diagram. (8)
(ii) Identify how a frequency doubler can be realized using this cell. (5)
BTL 3
BTL 3
Applying
Applying
4. Discuss any three applications of PLL in detail. (13) BTL 3 Applying
5. Explain the purpose and functioning of
(i)Frequency division circuit using PLL IC565 (7)
(ii) Frequency synthesizer (6)
BTL 2 Understanding
6. (i) Estimate the working principle of operational Transconductance
Amplifier (OTA). (8)
(ii) Explain the application of VCO for FM generation. (5)
BTL 3 Applying
7. (i)Define capture range and lock range. (3)
(ii) Explain the process of capturing the lock and also derive for capture
range and lock range. (10)
BTL 1 Remembering
8. (i) How would you explain the working of a VCO? (6)
(ii) Derive the expression for voltage to frequency conversion factor. (7).
BTL 1 Remembering
7. 8
9. Determine how the IC 565 PLL can be used as a Frequency
multiplier/divider. (13)
BTL 3 Applying
10. (i)Examine the multiplier cell using emitter‐coupled transistor pair. (8)
(ii) Analyze that the output voltage is proportional to the product of the
two input voltages and state their limitations. (5)
BTL 3 Applying
11. Briefly explain the use of PLL for FM detection and the process of FSK
demodulation. (13)
BTL 1 Remembering
12. Discuss the following applications of Analog Multiplier ICs
(i)Voltage squarer (3)
(ii)voltage divider (4)
(iii)square rooter (3)
(iv)Phase angle detector (3)
BTL 2 Understanding
13. (i)For PLL 565, given the free-running frequency as 100KHz, the
demodulation capacitor of 2µf and supply voltage is ±6V, determine the
lock and capture frequencies and identify the component values. (8)
(ii) A PLL has a free running frequency of 300KHz and the bandwidth
of the low pass filter is 50KHz. Check whether the loop acquires lock
for an input signal of 320KHz. (5)
BTL 3
BTL 3
Applying
Applying
14. (i) Inspect the variable Trans conductance Analog multiplier.(5)
(ii) Determine the output frequency f0, lock range ΔfL and capture range
ΔfC of IC 565. Assume R1=15K C1=0.01µF, C=1µF and the supply
voltage is +12V. (8)
BTL 3 Applying
PART - C
1. (i)Discuss the basic analog multiplication techniques. (7)
(ii)Develop the expression for free running frequency of voltage
controlled oscillator. (8)
BTL 3 Applying
2. Explain the operation of a variable trans conductance multiplier circuit.
Derive the expression for its output voltage. (15)
BTL 3 Applying
3. Measure the closed loop analysis of PLL with necessary diagrams. (15) BTL 3 Applying
4. Construct the block diagram and explain principle of working,
characteristics and applications of:
(i) Frequency synthesizer. (8)
(ii) Frequency shift keying (FSK) Demodulator (7)
BTL 3 Applying
UNIT IV ANALOG TO DIGITAL AND DIGITAL TO ANALOG CONVERTERS
Analog and Digital Data Conversions, D/A converter – specifications weighted resistor type, R‐2R Ladder
type, Voltage Mode and Current‐Mode R ‐2R Ladder types ‐switches for D/A converters, high speed
sample‐and‐hold circuits, A/D Converters – specifications ‐Flash type ‐Successive Approximation type ‐
Single Slope type – Dual Slope type ‐A/D Converter using Voltage‐to‐Time Conversion ‐Over‐sampling
A/D Converters, Sigma- Delta converters
PART A
Q.
No
Questions BT
Level
Competence
1. Classify the A/D converters based on their operational features. BTL 2 Understanding
2. List the direct type ADCs. BTL 3 Applying
8. 9
3. What is the function of integrating type converter? List out some
integrating type converters.
BTL 1 Remembering
4. Review the principle of operation of successive Approximation ADC. BTL 2 Understanding
5. Cite the main advantages of integrating type ADCs. BTL 1 Remembering
6. Define Sampling . BTL 1 Remembering
7. Compare the advantages and drawbacks of a dual‐slop ADC. BTL 2 Understanding
8. Distinguish between conversion time and settling time. BTL 3 Applying
9.
Find the number of resistors required for an 8-bit weighted resistor
D/A converter. Consider the smallest resistance is R and obtain those
resistance values.
BTL 3 Applying
10.
Give the advantages of inverted R-2R (current type) ladder D?A
converter over R -2R(voltage type) D/A converter ?
BTL 1 Remembering
11.
Brief the need for electronic switches in D/A converter and mention
the names of the switches used in MOS transistors.
BTL 1 Remembering
12. Summarize delta modulation. BTL 2 Understanding
13. How would you justify which type of ADC is the fastest? BTL 3 Applying
14. Outline the principle of operation of voltage to time conversion. BTL 1 Remembering
15. Calculate the values of LSB and MSB for an 8‐bit DAC for 0V to 10V
range.
BTL 3 Applying
16. Interpret the features of granular error and slope overload error. BTL 3 Applying
17.
An 8 bit A/D converter accepts an input voltage signal of range 0 to
12v. What is the digital output for an input voltage of 6V?
BTL 3 Applying
18. Evaluate the number of comparators required for realizing a 4‐bit flash
ADC.
BTL 3 Applying
19. Compare and contrast binary weighted and R‐2R ladder DAC. BTL 3 Applying
20.
Identify the need of Sample and hold circuit and Why schottky diodes
are used in sample and hold circuits?
BTL 3 Applying
PART – B
1. (i)
(ii)
How would you categorize A/D converters?
Discuss the working principle of successive approximation
type ADC.
(6)
(7)
BTL 2 Understanding
2. (i)
(ii)
Estimate the working of R‐2R ladder type DAC.
Compare binary weighted DAC with R‐2R ladder network
DAC.
(7)
(6)
BTL 3 Applying
3.
(i)
(ii)
With circuit schematic explain analog switches using FET.
What is meant by resolution, offset error in ADC.
(7)
(6)
BTL 1 Remembering
4.
(i)
(ii)
Explain in detail on the operational features of 4-bit
weighted resistor type D/A converter.
Differentiate between current mode and voltage mode R-2R
ladder D/A converters.
(7)
(6)
BTL 3 Applying
5. Show the operation of any two direct type of ADCs and Explain. (13) BTL 1 Remembering
6. Summarize the following Digital to Analog & Analog to Digital
conversion techniques.
(i)Flash type ADC
(ii)Weighted resistor DAC
(7)
(6)
BTL 2 Understanding
7. (i)
(ii)
Draw the diagram of sample and hold circuit.
State how you will reduce its hold mode droop.
(6)
(7)
BTL 1 Remembering
9. 10
8. Design a 4–bit binary weighted resistor DAC for the following
specifications: Use LM741 op‐amp, R = 10kΩ, Vref =2.5V and full
scale output = 5V.
(13)
BTL 3 Applying
9. A dual slope ADC has a full scale input of 2 Volts .It uses an integrating
time of 10ms and integrating capacitor of 0.1µf.the maximum
magnitude of the integrator output should not exceed 3V. Calculate the
value of the integrating resistor.
(13)
BTL 3 Applying
10. Describe in detail about the single slope type ADC with neat sketch. (13) BTL 3 Applying
11. (i)
(ii)
Sketch the block diagram and explain the working of Charge
Balancing VFCS
With functional block diagram explain A/D converter using
Voltage to Time converter with input and output waveforms.
(6)
(7)
BTL 1 Remembering
12. (i)
(ii)
Elaborate the operation of high speed sample and hold
circuits.
Develop a system employs a 16-bit word for representing the
input signal. If the maximum output voltage is set 2V,
calculate the resolution of the system and its dynamic range.
(9)
(4)
BTL 3 Applying
13. (i)
(ii)
Summarise the various important specifications of both D/A
and A/D converters generally specified by the manufactures
are analysed.
A 8-bit A/D converter accepts an input voltage signal of
range 0 to 9V, What is the minimum value of the input
voltage required for generating a change of 1 least significant
bit ? specify the digital output for an input voltage of 4 V.
What input voltage will generate all 1s at the A/D converter
output?
(7)
(6)
BTL 2 Understanding
14. (i)
(ii)
(iii)
The basic step of a 9-bit DAC is 10.3mV. If 000000000
represents 0V, what output is produced if the input is
101101111? Calculate the values of the LSB,
MSB and full scale output for an 8-bit DAC for the 0 to 10V
range.
What output voltage would be produced by a D/A converter
whose output range is 0 to 10V and whose input binary
number is
(i) 10 (for a 2-bit D/A converter)
(ii) 0110 (for a 4-bit DAC)
(iii) 10111100 (for a 8-bit DAC)
(3)
(5)
(5)
BTL 3 Applying
PART - C
1. (i)
(ii)
For a 4-bit R-2R ladder D/A converter assume that the full scale
voltage is 16V.Calculate the step change in output voltage on
input varying from 01111 to 1111.
Discuss the important specification of Data Converters.
(10)
(5)
BTL6 Applying
2. (i)
(ii)
(iii)
Compare single slope ADC and dual slope ADC.
Draw the circuit and explain the working of dual slope A/D
converter.
Calculate t2 for a particular dual slope ADC, t1 is 83.33ms and
the reference voltage is 100mv if
1. V1 is 100 mv and
2. 200 mv
(3)
(7)
(5)
BTL 3 Applying
10. 11
3. Design the R-2R 4-bit converter and assume that feedback resistance
Rf of the op-amp is variable, the resistance R=10kΩ and VR =10V.
Determine the value of Rf that should be connected to achieve the
following output conditions.
(i) The value of 1 LSB at the output is 0.5V
(ii) An analog output of 6V for a binary input of 1000.
(iii) The Full-scale output voltage of 12V
(iv) The actual maximum output voltage of 10V
(15)
BTL 3 Applying
4. (i)
(ii)
Derive the Inverted or Current mode R-2R Ladder Digital to
analog converter and explain.
Examine the inverted R-2R ladder (refer above question) has
R=Rf=10kΩ and VR=10V. Calculate the total current delivered
to the op-amp and the output voltage when the binary input
is 1110.
(10)
(5)
BTL 3 Applying
UNIT V WAVEFORM GENERATORS AND SPECIAL FUNCTION ICS
Sine-wave generators, Multivibrators and Triangular wave generator, Saw-tooth wave generator, ICL8038
function generator, Timer IC 555, IC Voltage regulators – Three terminal fixed and adjustable voltage
regulators - IC 723 general purpose regulator - Monolithic switching regulator, Low Drop –out(LDO)
Regulators -Switched capacitor filter IC MF10, Frequency to Voltage and Voltage to Frequency converters,
Audio Power amplifier, Video Amplifier, Isolation Amplifier, Opto-couplers and fibre optic IC.
PART A
Q. No Questions BT
Level
Competence
1. What is the need for voltage regulator ICs? BTL 2 Understanding
2. List the characteristics and applications of Opto coupler. BTL 3 Applying
3. Sketch a fixed voltage regulator circuit and state its operation. BTL 1 Remembering
4. Give the conditions for oscillation. BTL 2 Understanding
5. What is a switching regulator? BTL 1 Remembering
6. List the applications of 555 timer in Monostable mode of operation. BTL 1 Remembering
7. Classify the three different wave forms generated by ICL8038. BTL 2 Understanding
8. Mention the need for current limiting in voltage regulators. BTL 3 Applying
9. Compare Linear regulator and Switched mode regulator. BTL 3 Applying
10. Mention the function of a voltage regulator .Give some examples of
monolithic IC voltage regulators.
BTL 1 Remembering
11. Draw the functional block diagram of IC 723 regulator. BTL 1 Remembering
12. Compare the principle of linear regulator and a switched mode power supply. BTL 2 Understanding
13. How would you classify an opto-coupler , also mention the current transfer
ratio of an opto coupler.
BTL 3 Applying
14. Define line and load regulation of a regulator. BTL 1 Remembering
15. In a Astable multivibrator of 555 times RA=606kΩ and C=0.1μF. Calculate
(a) t HIGH (b)tLOW (c) free running frequency (d) duty cycle (D).
BTL 3 Applying
16. How does switched capacitor emulate resistor? BTL 3 Applying
17. With reference to a VCO, define voltage to frequency conversion factor Kv. BTL 3 Applying
18. In a monostable multivibrator using 555 timer, R=100kΩ and the time delay
is 100ms.Find the value of C.
BTL 3 Applying
19. List the types of Multivibrator. BTL 3 Applying
20. Give reasons for the purpose of connecting a capacitor at the input and output
side of an IC voltage regulator?
BTL 3 Applying
PART – B
11. 12
1. Write a short notes on
(i) Opto couplers
(ii) Switched capacitor filter
(iii)Audio power amplifier
(13) BTL 2 Understanding
2. (i)
(ii)
Demonstrate and explain the functional diagram of LM 380
power amplifier.
Illustrate the essential characteristics of power amplifier.
(8)
(5)
BTL 2 Understanding
3. (i)
(ii)
What is 555 timer? Explain the working of 555 timer as
Monostable Multivibrator.
Derive an expression for the frequency of oscillation with
relevant waveforms.
(7)
(6)
BTL 1 Remembering
4. (i)
(ii)
Analyze and explain the operation of switching regulator with
neat diagram.
Examine the operation of frequency to voltage converters.
(8)
(5)
BTL 3 Applying
5. (i)
(ii)
Show the working of Astable Multivibrator using op-amp.
Outline any one application of Astable Multivibrator in detail.
(8)
(5)
BTL 1 Remembering
6. (i)
(ii)
Design a phase shift oscillator to oscillate at 100 Hz.
Design a frequency to voltage converter using IC VFC 32 for a
full scale output of 8V for a full scale input frequency of
80kHz with a maximum ripple of 8mV.
(6)
(7)
BTL 3 Applying
7. (i)
(ii)
Define voltage regulator and explain the working of Linear
Voltage regulator with neat circuit diagram using op-amps.
List any two important features of linear voltage regulator
IC723.
(8)
(5)
BTL 1 Remembering
8. (i)
(ii)
Assess the working principle of monolithic switching regulator.
Evaluate how the frequency is computed using voltage to
frequency converter.
(8)
(5)
BTL 3 Applying
9. (i)
(ii)
With neat diagram, explain the operation of an astable and
monostable multivibrators using opamp.
Illustrate the functional diagram and connection diagram of a
low voltage regulator and explain.
(8)
(5)
BTL 3 Applying
10. (i)
(ii)
Develop the basic principle of function generator? Draw the
schematic of ICL 8038 function generator and discuss its
features. Solve the expression for the frequency
of a triangular waveform generator and explain the circuit.
(7)
(6)
BTL3 Applying
11. (i)
(ii)
Describe the 555 timer IC.design a astable multivibrator circuit
to generate output pulses of 25%,50% duty cycle using a 555
timer IC with the choice of C=0.01μF and a frequency of 4
kHz.
Demonstrate Monostable multivibrator with necessary diagrams
and derive for ON time and recovery time.
(6)
(7)
BTL 2 Understanding
12. (i)
(ii)
Interpret the working of monostable multivibrator.
What are opto-couplers?
(10)
(3) BTL 1 Remembering
13. (i)
(ii)
Applying the working of a general purpose voltage
regulator.
Justify the need for isolation amplifiers.
(10)
(3) BTL 3 Applying
14. With a neat circuit diagram, explain the working of linear voltage
regulator using operational amplifier.
(13)
BTL 3 Applying
PART C
12. 13
Q.
No
Questions BT
Level
Competence
1. (i)
(ii)
In a astable multivibrator using 555 timer Ra=6.8K,Rb = 3.3K,
C=0.1uF.Calculate the free running frequency.
Design a square wave generator using 555timer for a frequency
of 120Hz and 60% duty cycle. Assume C=0.2uF.
(8)
(7)
BTL 3 Applying
2. (i)
(ii)
Analyze the important features and pin details of switched
capacitor filter IC MF10.
Design a wave generator using 555 timer for a frequency of
110Hz and 80 % duty cycle. Assume C =0.12µF
(8)
(7)
BTL 3 Applying
3. Derive the expression and circuit operation for LM 380 Audio power
amplifier.
(15)
BTL 3 Applying
4. Design an adjustable voltage regulator circuit using LM 317 for the
following specifications: Input dc voltage =13.5 V; Output dc voltage = 5
to 9V; Load current (maximum) = 1A.
(15)
BTL 3 Applying
